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    <title>Sphinx Decoders Codewalk, Mar 2000</title>
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    <H1><U>Sphinx-3 Decoders Codewalk</U></H1>
    <center>
      Mosur K. Ravishankar (<em>aka</em> Ravi Mosur)<br>
      Sphinx Speech Group<br>
      School of Computer Science<br>
      Carnegie Mellon University<br>
      Pittsburgh, PA 15213<br>
      <a href="mailto:rkm@cs.cmu.edu">rkm@cs.cmu.edu</a><br>
      03 Mar 2000
    </center>
    
    
    <H2><U>Contents</U></H2>
    
    <div class="wheatbox">
      <UL>
	<LI><A HREF="#sec_intro">What's Around and Where</A></LI>
	<LI><A HREF="#sec_s32">s3.2</A></LI>
	<LI><A HREF="#sec_s3">s3 (Original)</A></LI>
	<LI><A HREF="#sec_s2">s2 FBS8</A></LI>
      </UL>
    </div>
    
    
    <H2><a name="sec_intro"><U>What's Around and Where</U></a></H2>

    <table border="1" cellpadding="6">
      <tr><th>Name</th><th>Remarks</th></tr>
      <tr><td>CVSROOT</td>
	<td>
	  <UL>
	    <LI>Location: <a href="/net/alf20/usr1/rkm/cvsroot"><code>/net/alf20/usr1/rkm/cvsroot</code></a></LI>
	    <LI>Not everything listed below is under CVS, however</LI>
	  </UL>
	</td>
      </tr>

      <tr><td>s3.2</td>
	<td>
	  <UL>
	    <LI>Location: <a href="/net/alf20/usr1/rkm/cvsroot/s3.2"><code>$CVSROOT/s3.2</code></a></LI>
	    <LI>Fast Sphinx-3 decoder using lextree organization:
	      <UL>
		<LI>5-10x real time speed on large vocabulary tasks</LI>
		<LI>Continuous density acoustic models only</LI>
		<LI>Batch-Mode operation only</LI>
	      </UL>
	    </LI>
	    <LI><code>gausubvq</code>: Sub-vector clustered acoustic model building
	      <UL>
		<LI>Needed for fast acoustic model evaluation</LI>
	      </UL>
	    </LI>
	    <LI>Documentation:
	      <UL>
		<LI><a href="/net/alf20/usr2/rkm/s3.2/doc/s3.html"><code>s3.2/doc/s3.html</code></a>:
		  User manual
		</LI>
		<LI><a href="/net/alf20/usr2/rkm/s3.2/doc/s3-2.ppt"><code>s3.2/doc/s3-2.ppt</code></a>:
		  Decoder tutorial
		</LI>
	      </UL>
	    </LI>
	  </UL>
	</td>
      </tr>
      
      <tr><td>libutil</td>
	<td>
	  <UL>
	    <LI>Location: <a href="/net/alf20/usr1/rkm/cvsroot/libutil"><code>$CVSROOT/libutil</code></a></LI>
	    <LI>Miscellaneous utilities needed by s3.2 (some of them by Eric Thayer
	      and Paul Placeway):
	      <UL>
		<LI>Platform-independent data types</LI>
		<LI>Command-line arguments parsing</LI>
		<LI>Hash tables</LI>
		<LI>Heap structures (for sorting)</LI>
		<LI>Memory allocation</LI>
		<LI>CPU usage profiling</LI>
		<LI>Error reporting</LI>
	      </UL>
	    </LI>
	    <LI>Not Sphinx specific</LI>
	  </UL>
	</td>
      </tr>

      <tr><td>s3</td>
	<td>
	  <UL>
	    <LI>Location: <a href="/net/alf20/usr2/rkm/s3/"><code>/net/alf20/usr2/rkm/s3</code></a></LI>
	    <LI>Original Sphinx-3 decoder</LI>
	    <LI>Slow; 50-100x real time speed on large vocabulary tasks</LI>
	    <LI>Any kind of acoustic model (discrete, semi-continuous, continuous, others)</LI>
	    <LI>Major applications:
	      <UL>
		<LI><code>s3decode</code> and <code>s3decode-anytopo</code>: Speech-to-text Decoding</LI>
		<LI><code>s3align</code>: Forced alignment</LI>
		<LI><code>s3allphone</code>: Allphone decoding</LI>
		<LI><code>s3astar</code>: A* search, nbest generation</LI>
		<LI><code>s3dag</code>: Shortest-path search</LI>
	      </UL>
	    </LI>
	    <LI>Other utilities:
	      <UL>
		<LI><code>stseg-read</code>: State-segmentation binary file reader</LI>
		<LI><code>sen2s2</code>: Sphinx-II "sendump" file creation from Sphinx-3
		  acoustic model</LI>
	      </UL>
	    </LI>
	    <LI>Documentation:
	      <UL>
		<LI><a href="/net/alf20/usr2/rkm/s3/doc/s3.html"><code>s3/doc/s3.html</code></a>:
		  User manual; <em>needs to be updated</em>
		</LI>
	      </UL>
	  </UL>
	</td>
      </tr>

      <tr><td>s2 (fbs8)</td>
	<td>
	  <UL>
	    <LI>Location: <a href="http://sourceforge.net/">Open source</a> (search for
	      "CMU Sphinx")</LI>
	    <LI>Sphinx-II decoder</LI>
	    <LI>Real-time operation</LI>
	    <LI>Semi-continuous, Sphinx-II acoustic models only (Sphinx-II format)</LI>
	    <LI>User applications support:
	      <UL>
		<LI>Compiled into a library with a straightforward API for building
		  speech-enabled applications</LI>
		<LI>Continuous-listening support</LI>
		<LI>Dynamic language model loading and switching</LI>
	      </UL>
	    </LI>
	    <LI>Several test applications:
	      <UL>
		<LI>Basic dictation with and without "push-to-talk"</LI>
		<LI>Basic audio recording and playback</LI>
		<LI>Audio segmentation using the continuous listener</LI>
	      </UL>
	    </LI>
	    <LI>Additional recognition modes:
	      <UL>
		<LI>Forced alignment</LI>
		<LI>Allphone decoding</LI>
		<LI>A* search, nbest generation</LI>
		<LI>Shortest-path search</LI>
	      </UL>
	    </LI>
	  </UL>
	</td>
      </tr>
      
      <tr><td>lm3g2dmp</td>
	<td>
	  <UL>
	    <LI>Location: <a href="/net/alf20/usr1/rkm/cvsroot/lm3g2dmp"><code>$CVSROOT/lm3g2dmp</code></a></LI>
	    <LI>Conversion from "arpabo" format language model file to binary ("dump")
	      format used by all decoders</LI>
	  </UL>
	</td>
      </tr>
      
      <tr><td>SphinxOCX</td>
	<td>
	  <UL>
	    <LI>Location: <a href="//ppro7/c/users/rkm/SphinxOCX/"><code>//ppro7/c/users/rkm/SphinxOCX</code></a></LI>
	    <LI>OCX wrapper for the fbs8 libraries</LI>
	    <LI>Windows NT only</LI>
	  </UL>
	</td>
      </tr>
      
      <tr><td>data</td>
	<td>
	  <UL>
	    <LI>Location: <a href="/net/alf20/usr/rkm/SHARED/"><code>/net/alf20/usr/rkm/SHARED</code></a></LI>
	    <LI>An attempt at collecting all available data and models under one roof (not
	      entirely successful):
	      <UL>
		<LI>Cepstrum files</LI>
		<LI>Control files</LI>
		<LI>HMMs (acoustic models)</LI>
		<LI>Language models</LI>
		<LI>Dictionaries</LI>
	      </UL>
	    </LI>
	    <LI>Implemented mainly via symbolic links, rather than physical copies</LI>
	  </UL>
	</td>
      </tr>
    </table>
    <P></P>
    <div class="endsec">&curren</div>
    
    
    <H2><a name="sec_s32"><U>s3.2</U></a></H2>
    
    <P>See <a href="/net/alf20/usr2/rkm/s3.2/doc/s3.html">s3.2/doc/s3.html</a>.
    </P>

    <pre>
 s3types.h
 logs3.c
 logs3.h
 bio.c
 bio.h
 vector.c
 vector.h
 corpus.c
 corpus.h
 agc.c
 agc.h
 cmn.c
 cmn.h
 feat.c
 feat.h
 dict.c
 dict.h
 lm.c
 lm.h
 lmtest.c
 mdef.c
 mdef.h
 mdeftest.c
 cont_mgau.c
 cont_mgau.h
 subvq.c
 subvq.h
 svqtest.c
 fillpen.c
 fillpen.h
 tmat.c
 tmat.h
 wid.c
 wid.h
 dict2pid.c
 dict2pid.h
 dict2pidtest.c
 kbcore.c
 kbcore.h
 hyp.h

 main.c
 ascr.c
 ascr.h
 beam.c
 beam.h
 hmm.c
 hmm.h
 kb.h
 lextree.c
 lextree.h
 vithist.c
 vithist.h

 gausubvq.c
 gautest.c</pre>


    <div class="endsec">&curren</div>
    <P></P>
    
    
    <H2><a name="sec_s3"><U>s3 (Original)</U></a></H2>
    
    <P>See <a href="/net/alf20/usr2/rkm/s3/doc/s3.html">s3/doc/s3.html</a> (needs
      to be updated), and <a href="/net/alf20/usr2/rkm/s3/tests/">s3/tests</a>.
    </P>
    <div class="endsec">&curren</div>
    <P></P>
    
    
    <H2><a name="sec_s2"><U>s2 FBS8</U></a></H2>
    
    <P><a href="http://sourceforge.net/">Open source</a> (search for CMU Sphinx)</P>
    <div class="endsec">&curren</div>
    <P></P>


    <address><a href="mailto:rkm@alf20.speech.cs.cmu.edu">Ravishankar Mosur</a></address>
<!-- Created: Fri Mar  3 11:03:47 EST 2000 -->
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Last modified: Wed Mar  8 13:25:39 EST 2000
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